WO2017018812A1 - Method and apparatus for performing ranging operation in wireless communication system - Google Patents

Abstract

The present specification may provide a method for performing ranging operation by an NAN terminal in a wireless communication system. In this instance, the method for performing a ranging operation may comprise: transmitting a first frame including ranging setting attribute information from a first NAN terminal to a second NAN terminal; performing an FTM procedure on the basis of the ranging setting attribute information; obtaining information associated with a distance to the second NAN terminal on the basis of the performed FTM procedure; and reporting the obtained distance information to a higher layer. In this instance, the obtained distance information may be reported to the higher layer through a ranging result reporting event.

Description

Method and apparatus for performing ranging operation in wireless communication system

The present specification relates to a wireless communication system, and more particularly, to a method and apparatus for performing a ranging operation in a wireless communication system.

Wireless communication systems are widely deployed to provide various kinds of communication services such as voice and data. In general, a wireless communication system is a multiple access system capable of supporting communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.). Examples of multiple access systems include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, and single carrier frequency (SC-FDMA). division multiple access (MCD) systems and multi-carrier frequency division multiple access (MC-FDMA) systems.

In addition, with the development of information and communication technology, various wireless communication technologies have been developed. Among these, WLAN is based on radio frequency technology, and can be used in homes, businesses, or businesses by using portable terminals such as personal digital assistants (PDAs), laptop computers, and portable multimedia players (PMPs). It is a technology that allows wireless access to the Internet in a specific service area.

An object of the present specification is to provide a method and apparatus for performing ranging operation in a wireless communication system.

This specification is an object of the present invention to provide a method for performing a ranging service by a neighbor awareness networking (NAN) terminal in a wireless communication system.

An object of the present specification is to provide a method of applying a fine timing measurement (FTM) protocol to a NAN terminal in a wireless communication system.

An object of the present specification is to provide a method for delivering a result of performing information to another NAN terminal by a NAN terminal after performing a ranging operation in a wireless communication system.

According to an embodiment of the present invention, a method for performing a ranging operation by a NAN terminal in a wireless communication system may be provided. At this time, the method for performing the ranging operation, the first NAN terminal transmits the first frame including the ranging configuration attribute information to the second NAN terminal, performing the FTM procedure based on the ranging configuration attribute information The method may include acquiring distance information with the second NAN terminal based on the performed FTM procedure and reporting the acquired distance information to a higher layer. In this case, the acquired distance information may be reported to a higher layer through a ranging result reporting event.

In addition, according to an embodiment of the present invention, it is possible to provide a first NAN terminal for performing a ranging operation in a wireless communication system. In this case, the first NAN terminal may include a receiving module for receiving information from an external device, a transmitting module for transmitting information to the external device, and a processor for controlling the receiving module and the transmitting module. In this case, the processor transmits the first frame including the ranging configuration attribute information to the second NAN terminal by using the transmission module, performs the FTM procedure based on the ranging configuration attribute information, and based on the performed FTM procedure. The distance information with the second NAN terminal may be acquired and the acquired distance information may be reported to a higher layer. In this case, the acquired distance information may be reported to a higher layer through a ranging result reporting event.

In addition, the following may be commonly applied to a method and apparatus for performing ranging operation in a wireless communication system.

According to an embodiment of the present invention, when the FTM procedure is performed, the first NAN terminal may perform one of the initiator role and the responder role.

In this case, according to an embodiment of the present invention, when the first NAN terminal plays a role of initiator, when the FTM procedure is performed, distance information may be directly calculated and obtained.

In addition, according to an embodiment of the present invention, when the first NAN terminal serves as a initiator, the ranging result reporting event includes at least any one of address information about the second NAN terminal and location information about the second NAN terminal. One more may be included.

In addition, according to an embodiment of the present invention, when the first NAN terminal serves as a responder, when the FTM procedure is performed, the first NAN terminal may receive a message including distance information from the second NAN terminal to obtain distance information.

In this case, according to an embodiment of the present invention, when the first NAN terminal serves as a responder, the ranging result report event may include at least one of address information about the received second NAN terminal and location information about the second NAN terminal. Any one may be further included.

In addition, according to an embodiment of the present invention, the ranging setting attribute information may further include a starter role and a responder role setting information.

Further, according to an embodiment of the present invention, the ranging operation is performed based on the ranging service, and if the first NAN terminal receives a method for ranging service from a higher layer, the ranging operation includes information on ranging configuration attributes. One frame may be transmitted to the second NAN terminal.

At this time, according to an embodiment of the present invention, the ranging operation may be performed as a filter operation for the first service.

In this case, according to an embodiment of the present invention, if the distance information obtained based on the ranging operation is less than or equal to the threshold value, an additional procedure for the first service may be performed.

In addition, according to an embodiment of the present invention, the first frame may be a service discovery frame.

In addition, according to an embodiment of the present specification, the upper layer may be a layer for a service.

In addition, according to one embodiment of the present specification, before the first NAN terminal transmits the first frame to the second NAN terminal, the method may further include exchanging distance measurement related information necessary for obtaining distance information.

In addition, according to one embodiment of the present specification, distance measurement related information may be exchanged in the first NAN terminal and the second NAN terminal based on at least one of a legacy method and a legacy event.

Also, according to one embodiment of the present specification. The distance measurement related information may be exchanged between the first NAN terminal and the second NAN terminal when at least one of a dedicated method and a dedicated event for distance measurement is called.

The present disclosure may provide a method and apparatus for performing ranging operation in a wireless communication system.

The present specification may provide a method for a NAN terminal to perform a ranging service in a wireless communication system.

The present disclosure may provide a method of applying the FTM protocol to a NAN terminal in a wireless communication system.

The present specification relates to a method for delivering performance result information to another NAN terminal by a NAN terminal after performing a ranging operation in a wireless communication system.

Effects obtained in the present specification are not limited to the above-mentioned effects, and other effects not mentioned above may be clearly understood by those skilled in the art from the following description. will be.

1 is a diagram illustrating an exemplary structure of an IEEE 802.11 system.

2 to 3 are diagrams illustrating a NAN cluster.

4 illustrates a structure of a NAN terminal.

5 to 6 show the relationship of the NAN components.

7 is a diagram illustrating a state transition of a NAN terminal.

8 is a diagram illustrating a discovery window and the like.

9 illustrates a discovery window.

10 is a diagram illustrating how FTM is performed in a wireless device.

11 is a diagram illustrating a method of performing ranging operation in a NAN cluster.

12 is a diagram illustrating a method of performing a ranging operation based on a service.

13 is a diagram illustrating a method of performing a ranging operation based on an FTM protocol.

14 is a diagram illustrating a method of exchanging information on a ranging operation.

15 is a flowchart illustrating a method of performing a ranging operation.

16 is a block diagram of a terminal device.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The detailed description, which will be given below with reference to the accompanying drawings, is intended to explain exemplary embodiments of the present invention and is not intended to represent the only embodiments in which the present invention may be practiced. The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, one of ordinary skill in the art appreciates that the present invention may be practiced without these specific details.

The following embodiments combine the components and features of the present invention in a predetermined form. Each component or feature may be considered to be optional unless otherwise stated. Each component or feature may be embodied in a form that is not combined with other components or features. In addition, some components and / or features may be combined to form an embodiment of the present invention. The order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment.

Specific terms used in the following description are provided to help the understanding of the present invention, and the use of such specific terms may be changed to other forms without departing from the technical spirit of the present invention.

In some instances, well-known structures and devices are omitted or shown in block diagram form, centering on the core functions of each structure and device, in order to avoid obscuring the concepts of the present invention. In addition, the same components will be described with the same reference numerals throughout the present specification.

Embodiments of the present invention are provided by standard documents disclosed in at least one of the wireless access systems IEEE 802 system, 3GPP system, 3GPP LTE and LTE-Advanced (LTE-A) system, 3GPP2 system, Wi-Fi system and NAN system Can be supported. That is, steps or parts which are not described to clearly reveal the technical spirit of the present invention among the embodiments of the present invention may be supported by the above documents. In addition, all terms disclosed in the present document can be described by the above standard document.

The following techniques include code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), and the like. It can be used in various radio access systems. CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA may be implemented with wireless technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE).

In addition, terms such as first and / or second may be used herein to describe various components, but the components should not be limited by the terms. The terms are only for the purpose of distinguishing one component from another component, for example, without departing from the scope of rights in accordance with the concepts herein, the first component may be called a second component, and similarly The second component may also be referred to as a first component.

In addition, throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, except to exclude other components unless otherwise stated. And “…” described in the specification. unit", "… “Unit” refers to a unit that processes at least one function or operation, which may be implemented in a combination of hardware and / or software.

Hereinafter, for the sake of clarity, the following description focuses on the IEEE 802.11 system, but the technical spirit of the present invention is not limited thereto.

Structure of WLAN System

1 is a diagram showing an exemplary structure of an IEEE 802.11 system to which the present invention can be applied.

The IEEE 802.11 architecture may be composed of a plurality of components, and by their interaction, a WLAN may be provided that supports transparent STA mobility for higher layers. The Basic Service Set (BSS) may correspond to a basic building block in an IEEE 802.11 WLAN. FIG. 1 exemplarily shows that two BSSs (BSS1 and BSS2) exist and include two STAs as members of each BSS (STA1 and STA2 are included in BSS1 and STA3 and STA4 are included in BSS2). do. In FIG. 1, an ellipse representing a BSS may be understood to represent a coverage area where STAs included in the BSS maintain communication. This area may be referred to as a basic service area (BSA). When the STA moves out of the BSA, the STA cannot directly communicate with other STAs in the BSA.

The most basic type of BSS in an IEEE 802.11 WLAN is an independent BSS (IBSS). For example, the IBSS may have a minimal form consisting of only two STAs. In addition, the BSS (BSS1 or BSS2) of FIG. 1, which is the simplest form and other components are omitted, may correspond to a representative example of the IBSS. This configuration is possible when STAs can communicate directly. In addition, this type of WLAN is not configured in advance, but may be configured when a WLAN is required, and may be referred to as an ad-hoc network.

The membership of the STA in the BSS may be dynamically changed by turning the STA on or off, the STA entering or exiting the BSS region, and the like. In order to become a member of the BSS, the STA may join the BSS using a synchronization process. In order to access all services of the BSS infrastructure, the STA must be associated with the BSS. This association may be set up dynamically and may include the use of a Distribution System Service (DSS).

In addition, FIG. 1 illustrates components of a distribution system (DS), a distribution system medium (DSM), an access point (AP), and the like.

The station-to-station distance directly in the WLAN may be limited by PHY performance. In some cases, this distance limit may be sufficient, but in some cases, communication between more distant stations may be necessary. The distribution system DS may be configured to support extended coverage.

DS refers to a structure in which BSSs are interconnected. Specifically, instead of the BSS independently as shown in FIG. 1, the BSS may exist as an extended type component of a network composed of a plurality of BSSs.

DS is a logical concept and can be specified by the nature of the distribution system medium (DSM). In this regard, the IEEE 802.11 standard logically distinguishes between wireless medium (WM) and distribution system media (DSM). Each logical medium is used for a different purpose and is used by different components. The definition of the IEEE 802.11 standard does not limit these media to the same or to different ones. In this way the plurality of media are logically different, the flexibility of the IEEE 802.11 WLAN structure (DS structure or other network structure) can be described. That is, the IEEE 802.11 WLAN structure can be implemented in various ways, the corresponding WLAN structure can be specified independently by the physical characteristics of each implementation.

The DS may support the mobile device by providing seamless integration of multiple BSSs and providing logical services for handling addresses to destinations.

An AP refers to an entity that enables access to a DS through WM for associated STAs and has STA functionality. Data movement between the BSS and the DS may be performed through the AP. For example, STA2 and STA3 shown in FIG. 1 have the functionality of a STA, and provide a function to allow associated STAs STA1 and STA4 to access the DS. In addition, since all APs basically correspond to STAs, all APs are addressable entities. The address used by the AP for communication on the WM and the address used by the AP for communication on the DSM need not necessarily be the same.

Data transmitted from one of the STAs associated with an AP to the STA address of that AP may always be received at an uncontrolled port and processed by an IEEE 802.1X port access entity. In addition, when a controlled port is authenticated, transmission data (or frame) may be transmitted to the DS.

Hierarchy

The operation of the STA operating in the WLAN system may be described in terms of a layer structure. In terms of device configuration the hierarchy may be implemented by a processor. The STA may have a plurality of hierarchical structures. For example, the hierarchical structure covered by the 802.11 standard document is mainly the MAC sublayer and physical (PHY) layer on the DLL (Data Link Layer). The PHY may include a Physical Layer Convergence Procedure (PLCP) entity, a Physical Medium Dependent (PMD) entity, and the like. The MAC sublayer and PHY conceptually contain management entities called MAC sublayer management entities (MLMEs) and physical layer management entities (PLMEs), respectively.These entities provide a layer management service interface on which layer management functions operate. .

In order to provide correct MAC operation, a Station Management Entity (SME) is present in each STA. An SME is a layer-independent entity that can appear to be in a separate management plane or appear to be off to the side. While the exact features of the SME are not described in detail in this document, they generally do not include the ability to collect layer-dependent states from various Layer Management Entities (LMEs), and to set similar values for layer-specific parameters. You may seem to be in charge. SMEs can generally perform these functions on behalf of general system management entities and implement standard management protocols.

The aforementioned entities interact in a variety of ways. For example, entities can interact by exchanging GET / SET primitives. A primitive means a set of elements or parameters related to a particular purpose. The XX-GET.request primitive is used to request the value of a given MIB attribute (management information based attribute information). The XX-GET.confirm primitive is used to return the appropriate MIB attribute information value if the Status is "Success", otherwise it is used to return an error indication in the Status field. The XX-SET.request primitive is used to request that the indicated MIB attribute be set to a given value. If the MIB attribute means a specific operation, this is to request that the operation be performed. And, the XX-SET.confirm primitive confirms that the indicated MIB attribute is set to the requested value when status is "success", otherwise it is used to return an error condition in the status field. If the MIB attribute means a specific operation, this confirms that the operation has been performed.

In addition, the MLME and SME may exchange various MLME_GET / SET primitives through a MLME_SAP (Service Access Point). In addition, various PLME_GET / SET primitives may be exchanged between PLME and SME through PLME_SAP and may be exchanged between MLME and PLME through MLME-PLME_SAP.

NAN (Neighbor Awareness Networking) Topology

The NAN network may consist of NAN terminals using the same set of NAN parameters (eg, time interval between successive discovery windows, interval of discovery window, beacon interval or NAN channel, etc.). The NAN terminals may configure a NAN cluster, where the NAN cluster uses the same set of NAN parameters and means a set of NAN terminals synchronized to the same discovery window schedule. 2 shows an example of a NAN cluster. A NAN terminal belonging to a NAN cluster may directly transmit a multicast / unicast NAN service discovery frame to another NAN terminal within a range of a discovery window. As shown in FIG. 3, one or more NAN masters may exist in the NAN cluster, and the NAN master may be changed. In addition, the NAN master may transmit both a sync beacon frame, a discovery beacon frame, and a NAN service discovery frame.

NAN Device Architecture

4 shows a structure of a NAN terminal. As shown in FIG. 4, the NAN terminal is based on a physical layer of 802.11, and includes a NAN discovery engine, a NAN medium access control (MAC), and applications (Application 1, Application 2, ..., Application N). NAN APIs are the main component.

5 to 6 show the relationship of the NAN components. The service request and response are processed through the NAN discovery engine, and the NAN MAC processes the NAN Beacon frames and the NAN Service Discovery frame. The NAN discovery engine can provide the functionality of subscribe, publish, and follow-up. The publish / subscribe function operates from the service / application through the service interface. When the publish / subscribe command is executed, an instance of the publish / subscribe function is created. Each instance runs independently, and depending on the implementation, several instances can run simultaneously. The follow-up function is a means for a service / application to send and receive service specific information.

Role and state of NAN terminal

The NAN terminal may perform a master role and this may be changed. That is, the NAN terminal may transition various roles and states, and an example thereof is illustrated in FIG. 7. The role and state that a NAN terminal may have include a master (hereinafter, master is a master role and sync.State), a non-master sync, a non-master non-sync Sync) and the like. Each role and state may determine whether to transmit a discovery beacon frame and / or a sync beacon frame, which may be illustrated in Table 1 below.

TABLE 1

The state of the NAN terminal may be determined through a master rank. The master rank indicates the will of the NAN terminal to operate as a NAN master. In other words, a large value indicates a large preference for the NAN master. NAN MR may be determined by the following equation (1) by the Master Preference, Random Factor, Device MAC address.

[Equation 1]

The Master Preference, Random Factor, and Device MAC address may be indicated through a master indication attribute included in a NAN Beacon frame. The master indication attorney may be as illustrated in Table 2 below.

TABLE 2

In relation to the MR, the NAN terminal that activates the NAN service and starts the NAN cluster sets both the Master Preference and the Random Factor to 0, and resets the NANWarmUp. Until the NANWarmUp expires, the NAN terminal should set the Master Preference field value in the master indication attribute to a value greater than 0 and set the Random Factor value in the master indication attribute to a new value. A NAN terminal joining a NAN cluster having an anchor master's Master Preference set to a value greater than 0 may set the Master Preference to a value greater than 0 and set a Random Factor to a new value regardless of whether NANWarmUp expires. .

Subsequently, the NAN terminal may be an anchor master of the NAN cluster according to the MR value. That is, all NAN terminals have the capability to operate as an anchor master. The anchor master means a device having the largest MR in the NAN cluster, having a HC (Hop count to the Anchor Master) value of 0 and having the smallest Anchor Master Beacon Transmit Time (AMBTT) value. Two anchor masters may exist temporarily in a NAN cluster, but one anchor master is a principle. The NAN terminal which becomes the anchor master in the already existing NAN cluster uses the time synchronization function (TSF) used in the existing NAN cluster as it is.

The NAN terminal may be an anchor master in the following case. When a new NAN cluster is started, when a master rank is changed (when the MR value of another NAN terminal is changed or when the anchor master's own MR is changed), or when the beacon frame of the current anchor master is no longer received, the NAN The terminal may be an anchor master. In addition, when the MR value of another NAN terminal is changed or the MR of the anchor master itself is changed, the NAN terminal may lose the status of the anchor master. The anchor master may be determined by an anchor master selection algorithm as described below. That is, the anchor master selection is an algorithm for determining which NAN terminal is the anchor master of the NAN cluster, and each NAN terminal drives the anchor master selection algorithm when participating in the NAN cluster.

When the NAN terminal starts a new NAN cluster, the NAN terminal becomes an anchor master of the new NAN cluster. NAN sync beacon frames with hop counters exceeding the threshold are not used by the NAN terminal. Otherwise NAN sync beacon frame is used to determine the anchor master of the NAN cluster.

Upon receiving a NAN sync beacon frame having a hop counter that does not exceed the threshold, the NAN terminal compares the stored anchor master rank value with the anchor master rank value in the beacon frame. If the stored anchor master rank value is larger than the anchor master value in the beacon frame, the NAN terminal discards the anchor master value in the beacon frame. If the stored anchor master rank value is smaller than the anchor master value in the beacon frame, the NAN terminal stores a new value increased by 1 in the anchor master rank and the hop counter included in the beacon frame and the AMBTT value in the beacon frame. Also, if the stored anchor master rank value is equal to the anchor master value in the beacon frame, the hop counter is compared. If the hop counter value of the beacon frame is larger than the stored value, the NAN terminal ignores the received beacon frame. When the hop counter value of the beacon frame is equal to (stored value-1) and the AMBTT value is larger than the stored value, the NAN terminal newly stores the AMBTT value of the beacon frame. If the hop counter value of the beacon frame is less than (stored value-1), the NAN terminal increments the hop counter value of the beacon frame by one. The stored AMBTT value is updated according to the following rules. If the received beacon frame is transmitted by the anchor master, the AMBTT value is set to the lowest 4 octet value of the time stamp included in the beacon. If the received beacon frame is received from a device other than the NAN master or master sink, the AMBTT value is set to a value included in the NAN cluster attribute of the received beacon.

On the other hand, if the TSF timer of the NAN terminal exceeds the stored AMBTT value by more than 16 * 512 TUs (TU Units), (for example, 16 DW periods) or more, the NAN terminal assumes itself as an anchor master and sets an anchor master record. You can update it. In addition, if there is a change in any one of the elements included in the MR (Master Preference, Random Factor, MAC Address), the NAN terminal other than the anchor master compares the changed MR with the stored value. If the changed MR value of the NAN terminal is larger than the stored value, the NAN terminal may assume itself as an anchor master and update the anchor master record.

Also, the NAN terminal sets the anchor master field of the cluster attribute in the NAN sync and discovery beacon frame to the value in the anchor master record, except when the anchor master sets the AMBTT value to the TSF value of the corresponding beacon transmission. Can be. The NAN terminal transmitting the NAN sync or discovery beacon frame may ensure that the TSF of the beacon frame will be derived from the same anchor master included in the cluster attribute.

In addition, the NAN terminal i) when the NAN beacon indicates an anchor master rank of a value larger than the anchor master record of the NAN terminal, ii) the NAN beacon indicates an anchor master rank of the same value as the anchor master record of the NAN terminal, When the hop counter value and the AMBTT value of the NAN beacon frame indicate a value larger than the anchor master record, the TSF timer value in the NAN beacon received with the same cluster ID may be applied.

NAN synchronization

NAN terminals participating in the same NAN cluster may be synchronized to a common clock. TSF of the NAN cluster may be implemented by a distributed algorithm that must be performed in all NAN terminals. Each NAN terminal participating in the NAN cluster may transmit NAN Sync. Beacon frames according to the algorithm. The device may synchronize its clock during the discovery window DW. The length of the discovery window is 16 TUs. During the discovery window, one or more NAN terminals may transmit synchronization beacon frames to help all NAN terminals in the NAN cluster synchronize their clocks.

NAN Beacon transmission is distributed. The transmission time of the NAN Beacon frame is a discovery window interval existing every 512 TUs. All NAN terminals may participate in NAN beacon generation and transmission according to the role and state of the device. Each NAN terminal must maintain its own TSF timer used for NAN beacon cycle timing. The NAN sync beacon period may be established by the NAN terminal generating the NAN cluster. A series of TBTTs are defined such that the discovery window interval that can transmit a sync beacon frame is exactly 512 TU apart. A time of zero is defined as the first TBTT, and the discovery window starts at each TBTT.

Each NAN terminal serving as a master transmits a NAN discovery beacon frame outside the NAN discovery window. On average, the NAN terminal in the master role transmits the NAN discovery beacon every 100 TUs. The time between successive NAN discovery beacons transmitted from the same NAN terminal is 200 TUs or less. When the scheduled transmission time overlaps with the NAN discovery window of the NAN cluster in which the NAN terminal participates, the NAN terminal in the master role may omit transmission of the NAN discovery beacon. In order to minimize power for transmitting the NAN discovery beacon frame, the NAN terminal in the master role may use a WMM Access Category-Voice (AC_VO) contention setting. 8 illustrates a relationship between the transmission of the NAN discovery beacon frame, the NAN sync / discovery beacon frame, and the discovery window. FIG. 8 (a) shows transmission of a NAN discovery beacon and a sync beacon frame of a NAN terminal operating in a 2.4 GHz band, and FIG. 8 (b) shows a NAN discovery beacon and synchronization of a NAN terminal operating in a 2.4 GHz and a 5 GHz band. Indicates transmission of a beacon frame.

9 illustrates a discovery window. As described above, each NAN terminal serving as a master may transmit a synchronization beacon frame in the discovery window and may transmit a discovery beacon frame outside the discovery window. In this case, as described above, the discovery window may be repeated every 512 TUs. In this case, the duration of the discovery window may be 16 TU. In other words, the discovery window may last for 16 TUs. In this case, as an example, all NAN terminals in the NAN cluster are awakened for each discovery window to receive a synchronization beacon frame from the master NAN terminal, thereby maintaining the NAN cluster. In this case, when all NAN terminals are fixedly awake for each discovery window, power consumption of the terminal may be severe. Therefore, there may be a need for a method of reducing power consumption by dynamically controlling the duration of the discovery window while maintaining synchronization in one NAN cluster.

In addition, as an example, as described above, the NAN terminal may operate in the 2.4 GHz band or the 5 GHz band. As another example, the NAN terminal may operate in the Sub 1 GHz band. For example, the NAN terminal may be configured to support IEEE 802.11ah supporting the Sub 1 GHz band. For example, when the NAN terminal supports 900MHz, the NAN terminal may have a different link quality and physical model from 2.4GHz or 5GHz.

For example, when the NAN terminal supports 900MHz, the NAN terminal may transmit a signal farther, and may perform communication in a wide range. In this case, data communication between NAN terminals may be performed, and data may be exchanged between NAN terminals. In this case, the method of efficiently operating power in the NAN terminal may be a problem because it is based on data communication. For this, a method of setting a discovery window section may be differently set. 9 is a basic structure in which a synchronization beacon frame is transmitted within a discovery window and a discovery beacon frame is transmitted outside the discovery window, and may be similarly applied to a NAN terminal supporting a 900 MHz band.

10 is a diagram illustrating how FTM is performed in a wireless device.

FTM may be performed to obtain location information as a relative distance between wireless devices. In this case, the wireless device requesting to perform the FTM may be an initiator STA (initiating STA) 1010, and the wireless device providing a response may be a responder STA (1020, 1030). In this case, as an example, the initiator STA 1010 may perform an FTM procedure with the responder STAs 1020 and 1030. Also, as an example, the initiator STA 1010 may perform an FTM procedure with the plurality of responder STAs 1020 and 1030, but is not limited to the above-described embodiment.

At this time, the FTM session may be composed of negotiation, measurement, and termination. That is, the initiator STA 1010 may obtain relative distance or location information of the responder STA through frame exchange in negotiation and measurement process with the responder STAs 1020 and 1030.

For example, referring to FIG. 10, the initiator STA 1010 may exchange an FTM frame with a responder STA 1020 and 1030 as a burst instance in a predetermined time window. Through this, the initiator STA 1010 may perform FTM with the responder STAs 1020 and 1030. In addition, as an example, as described above, the initiator STA 1010 may perform an FTM procedure using different channels from the responder STAs 1020 and 1030. In this case, as an example, a time when each responder STA 1020 or 1030 exchanges a frame with the initiator STA 1010 may overlap. Accordingly, the initiator STA 1010 may adjust the burst instance as a time interval for each responder STAs 1020 and 1030 to prevent a collision.

Also, as an example, the initiator STA 1010 may transmit an FTM request frame to the responder STAs 1020 and 1030 to perform the FTM. In this case, the responder STAs 1020 and 1030 may transmit a response frame based on the FTM request frame.

In this case, as an example, the frames exchanged between the initiator STA 1010 and the responder STAs 1020 and 1030 may include FTM parameters, and thus, distance information of the responder STAs 1020 and 1030 may be obtained.

11 is a diagram illustrating a method of performing ranging operation in a NAN cluster.

As described above, NAN terminals may form a NAN cluster. In this case, the NAN terminals included in the NAN cluster may provide mutual services. In addition, as an example, NAN terminals included in the NAN cluster may perform data exchange for a service, and are not limited to the above-described embodiment.

In this case, as an example, when the physical distance between the NAN terminals in the NAN cluster is too long or there is an obstacle, the NAN terminals may be limited in communication. In addition, a specific service for NAN terminals may operate only when there are NAN terminals within a threshold distance.

In consideration of the relationship between the NAN terminals, a definition of a ranging operation for checking the distance between the NAN terminals may be required. That is, an operation for acquiring distance information between the NAN terminals in the NAN cluster may be defined.

In this case, in FIG. 11, the plurality of NAN terminals may form a NAN cluster. In this case, the NAN terminals 1110 and 1120 existing in the NAN cluster may set a ranging operation in one or more time blocks for a ranging operation. In this case, as an example, distance measurement of NAN terminals may be performed based on an FTM protocol. Hereinafter, elements necessary for applying the NAN-based FTM protocol will be described.

12 is a diagram illustrating a method of performing a ranging operation based on a service.

As described above, NAN terminals need to obtain distance information between each other based on a ranging operation. For example, the ranging operation may operate as a higher level service. At this time, the ranging may operate as a higher service in relation to the ranging operation to the NAN terminals in the NAN cluster. That is, ranging may be a ranging service as one of services performed between NAN terminals. In this case, since the ranging operation is a service, the NAN terminal may perform a search as a service by using a publish and / or subscribe to search the ranging service as one service. That is, the service / application terminal of the NAN terminal may call a method for performing a search for a ranging service as a service to the NAN DE and NAN MAC terminals. In this case, the NAN terminals may perform a search for a ranging service or may be searched.

In this case, as an example, a service descriptor attribute (SDA) for a ranging service may be configured. In this case, various parameters such as a service ID and an instance ID may be additionally configured in the SDA. More specifically, when ranging is used as a service, information about whether there is a NAN device awakened in the NAN cluster and how far the NAN terminal is can be determined. Through this, the NAN terminal may check awake status and distance information of other NAN terminals in the NAN cluster, and may additionally provide a service different from the corresponding NAN terminals, and is not limited to the above-described embodiment.

The service / application terminal of the NAN terminal may transmit a publish and / or subscribe message after calling a method for a ranging service. In this case, the publishing and / or subscribe message may include a ranging setup attribute. In this case, as an example, NAN terminals may exchange initial configuration values for ranging through a ranging configuration attribute.

In this case, as an example, the publish and / or subscribe message may be in the form of a service discovery frame. As an example, the ranging attribute field may be included in the service discovery frame and may be as shown in Table 3 below. At this time, any one of bits reserved in Table 3 may be used as a ranging configuration attribute field. In Table 3, an attribute ID is set to 14, but is not limited thereto. That is, any one of the reserved bits may be defined as a ranging configuration attribute field, and is not limited to the above-described embodiment.

TABLE 3

In this case, the ranging attribute field includes at least one of a ranging control field, a NAN FTM parameter, a map control, and availability interval bitmap information. It may be, as shown in Table 4 below.

In this case, as an example, the ranging control field may include an indicator on who sends the FTM request. That is, it may be indicated whether the FTM initiator is, which will be described later. In addition, a specific parameter value of the NAN FTM parameter may be set. Also, as an example, an FTM type may be set, which will be described later.

TABLE 4

Also, as an example, the ranging setting attribute field may further include a last move indication field. In this case, the last movement indication field may include a value for a time synchronization function (TSF) for the corresponding NAN cluster.

In addition, the initiator NAN terminal may inform or request a ranging result using a ranging result attribute, which will be described later.

Also, as an example, distance measurement related information required to obtain distance information as a ranging result may be exchanged based on an existing method or event. In this case, as an example, the existing method or event may be a method or event called based on a publish / subscribe function. For example, after the NAN UEs perform a discovery for a service, distance measurement related information may be included in a discovery result (DiscoveryResult ()) event for reporting a discovery result. In addition, as an example, when a response (Replied ()) event is called based on a publishing function, distance measurement related information may be included in the response event. Also, as an example, the distance measurement related information may be information on whether the NAN terminals have the capability to perform the distance measurement and whether the related protocol is supported. In addition, other information necessary to obtain distance information may be distance measurement related information, and is not limited to the above-described embodiment.

As another example, distance measurement related information may be exchanged based on a dedicated method or a dedicated event for distance measurement related information required to obtain distance information. That is, when the dedicated method for the distance measurement-related information and the dedicated event are called in advance, the NAN terminals exchange the frames including the distance measurement-related information to acquire the distance measurement-related information necessary for obtaining the distance information in advance. Can be.

13 is a diagram illustrating a method of performing a ranging operation based on an FTM protocol.

As described above, the initiator STA 1320 may perform FTM by exchanging frames with the responder STA 1310 within a predetermined time interval.

In this case, referring to FIG. 13, the initiator STA 1320 may transmit an Initial FTM Request to the responder STA 1310 as an FTM trigger frame. In this case, the responder STA 1310 may transmit an ACK for checking whether the FTM request is received to the initiator STA 1320. Also, as an example, the responder STA 1310 may transmit an FTM response to the initiator STA 1320. In this case, the initiator STA 1320 may transmit an ACK frame confirming whether the FTM response is received to the responder STA 1310.

In this case, as an example, the start FTM request is a frame for starting the FTM, and the initiator STA 1320 may start the FTM procedure when a predetermined time elapses after receiving the ACK response.

Thereafter, the initiator STA 1320 may transmit the FTM frame for FTM measurement to the responder STA 1310 within a burst duration. In this case, as an example, a Time Synchronization Function (TSF) of the responder STA 1310 may be set to a partial TSF timer. That is, the partial TSF timer may mean a time at which the first duration starts.

Thereafter, the responder STA 1310 may transmit an FTM frame to the initiator STA 1320 at the point t1_1. In this case, the time when the initiator STA 1320 receives the FTM frame may be a point t2_1. Thereafter, the initiator STA 1320 may send an ACK to the responder STA 1310 at point t3_1. In this case, the point in time at which the responder STA 1310 receives the ACK tone may be point t4_1. In addition, the responder STA 1310 may transmit the FTM frame to the initiator STA 1320 again after a predetermined time elapses (Min-delta FTM). The frame may be received in the same manner as described above.

In this case, as an example, the initiator STA 1320 may calculate a round trip time (RTT) or a clock offset using t1_1 to t4_1 (or t2_1 to t2_4, t3_1 to t3_4) in the drawing. have. That is, the initiator STA 1320 may measure the time required for transmitting and receiving the frame transmission using the frame exchange time information with the responder STA 1310. In more detail, RTT may be the same as Equation 2 below.

[Equation 2]

That is, the RTT may mean a time at which the initiator STA 1320 and the responder STA 1310 exchange signals. In this case, as an example, the relative distance between the initiator STA 1320 and the responder STA 1310 may be determined by Equation 3 below based on the RTT.

[Equation 3]

In this case, C may be 3 * 10 ^ 8 (m / sec), and D may be distance. That is, the relative distance between the initiator STA 1320 and the responder STA 1310 may be calculated by calculating a value multiplied by the speed of the signal at the time when the signal is transmitted. In addition, as an example, when the location of the initiator STA 1320 is known, the location information may be acquired based on the relative location information of the responder STA 1310 and is not limited to the above-described embodiment.

In this case, when the NAN terminals in the NAN cluster perform the ranging operation, it may be necessary to determine whether to perform the above-described starter STA 1320 or the responder STA 1310 role.

In this case, the information for determining the initiator STA 1320 and the responder STA 1310 may be indicated through the ranging control field of the ranging setup attribute field described above.

As an example, roles for the initiator STA 1320 and the responder STA 1310 may be fixed. For example, the NAN terminal performing the publishing may be set only to the responder STA 1310, and the NAN terminal performing the subscription may be set only as the initiator STA 1320. In addition, as an example, the NAN terminal performing the publishing may be set only as the initiator STA 1320, and the NAN terminal performing the subscription may be set only as the responder STA 1310. That is, the initiator STA 1310 and the responder STA 1320 may be fixed based on whether to execute the publish / subscribe. As a result, when performing the ranging operation in the NAN cluster, a procedure of configuring the initiator STA 1320 and the responder STA 1310 may be omitted.

As another example, the NAN terminal may perform capability negotiation in publishing and / or subscription. In this case, as an example, negotiation may be set among A to C in Table 5 below. In this case, as an example, an STA (publisher STA, Publisher) that performs publishing and / or an STA (hereinafter, Subscriber STA, Subscriber) that performs a subscription may be selected and configured.

In this case, as an example, when both the publisher STA and the subscriber STA are set to be the same as A or B, the initiator STA 1320 and the responder STA 1310 are selected based on a random factor value as described below. You can decide.

In addition, as an example, when all terminals are set to be the same as C, a specific NAN terminal may preferentially play a desired role.

For example, a passive subscriber STA may first determine a desired role and provide information about the selected role to an unsolicited publisher STA. In this case, the unsolvated publisher STA may play an unselected role and may inform the passive subscriber STA of the information. In addition, as an example, it may provide information on the selected role to the unsolvented publisher STA. In this case, it may be determined that the unsolvented publisher STA is implicitly selected.

As another example, if one side selects A (starter STA) and the other side selects B (responder STA), the selection may be completed. Also, as an example, when one side selects A or B and the other side selects C, the terminal that selects C performs the other function.

In addition, as an example, the additional response message may notify that the negotiation is completed. For example, when the passive subscriber STA determines its role based on the selection value of the unsolvated publisher STA, the passive subscriber STA may perform a response as an additional message.

As another example, the solicited publisher STA may perform a response as an additional message when it selects a role by an active subscribed active subscriber (STA).

In addition, as an example, the following table 5 may be applied even if the ranging function is included as an attribute of another service, and is not limited to the above-described embodiment.

As another example, the above condition may be applied between the solicited publish STA and the passive subscribe STA. In addition, as an example, the above-described condition may be applied between the unsolvated publishing STA and the active subscription STA, and is not limited to the above-described embodiment.

TABLE 5

14 is a diagram illustrating a method of exchanging information on a ranging operation.

Referring to FIG. 14, the publisher STA 1410 may perform publishing in an unsolvated type. In this case, the service / application terminal of the publisher STA 1410 may call the method to provide information on the ranging service to the NAN DE and NAN MAC terminals. In this case, the publish STA 1410 may transmit a publish message to the subscriber STA 1420. In this case, as an example, the publish message may be transmitted in the form of a service discovery frame. In addition, as an example, the unsolicited publish message may be a message type in which the NAN terminal receiving the publish message does not necessarily transmit a response. On the other hand, the solicited publish message may be a message type that the NAN terminal that receives the publish message must transmit a response, and is not limited to the above-described embodiment.

In addition, referring to FIG. 14, the subscription STA 1420 may perform a subscription in a passive type. In this case, the service / application terminal of the subscription STA 1420 may provide information by calling a method to the NAN DE and the NAN MAC. In this case, as an example, when the subscriber STA 1420 receives the publish message from the publisher STA 1410, the subscriber STA 1420 may determine whether to match the service. In this case, matching for the service may be performed by a service ID, an instance ID, or the like.

Also, as an example, even when the subscription STA 1420 is an active subscription STA, messages for ranging service may be exchanged. For example, the active subscription STA may perform a search for a ranging service by directly transmitting a message, which is not limited to the above-described embodiment.

The NAN DE and NAN MAC stages of the subscription STA 1420 may call an event for a search result (SearchResult ()), and may provide information to the service / application stage through this. In this case, as an example, when the service is a ranging service, the search result event may include additional information about the ranging service. For example, information on a method of setting the above-described FTM initiator STA and information on a method of sending a ranging result report may be included. That is, the search result event may include information for performing a ranging operation later. In addition, as an example, the above-described capability negotiation information may be included, but is not limited to the above-described embodiment.

Subsequently, the subscription STA 1420 may be further associated with the overall ranging setting, such as information about conditional acceptance / unconditional acceptance / rejection, etc., in the ranging request with respect to the ranging service, and information on whether to request a ranging result. Information about the need may be provided to the publisher STA 1410. In this case, the method called by the service / application terminal of the subscription STA 1420 may be a transmit method, and the transmit method may be as shown in Table 6 below.

In this case, as an example, Table 6 below may be information defined when the subscription STA 1420 calls a transmission method for transmitting a follow-up message based on a service search result. That is, information for confirming a mutual relationship with respect to NAN terminals may be included for all services regardless of service specification.

In this case, for example, when searching for a service for a ranging operation and calling a transmission method, additional information related to ranging may be defined under service specific information (service_specific_info) or configuration parameter (configuration_parameters) of the transmission method. have.

In this case, as an example, the information on the ranging may include information about conditional acceptance / unconditional acceptance / rejection in the ranging request and information on whether a request for the ranging result is required. In addition, other information about ranging may be included, and is not limited to the above-described embodiment.

When the above-described transmission method is called, the subscribe STA 1420 may transmit a follow-up message including information on ranging to the publish STA 1410. Through this, the publisher STA 1410 may obtain information about ranging.

 TABLE 6

Also, as an example, when the publisher STA 1410 receives a follow-up message, the NAN DE and NAN MAC terminals of the publisher STA 1410 may call a receive event. That is, the NAN DE and NAN MAC terminals of the publisher STA 1410 may provide information based on the received follow-up message to the service / application terminal. In this case, the reception event may be as shown in Table 7 below. In this case, as an example, Table 7 below may be information defined when a reception event is called based on a follow-up message received by the publisher STA 1410. That is, information for confirming a mutual relationship with respect to NAN terminals may be included for all services regardless of service specification.

In this case, as an example, when the information on the service for the ranging operation is received as included in the follow-up message, the receive event may include information about the ranging operation. In this case, as an example, the service specific information (service_specific_info) of the receive event may include information on a ranging operation, and is not limited to the above-described embodiment.

TABLE 7

Thereafter, the publisher STA 1410 and the subscriber STA 1420 may perform the above-described FTM procedure as the ranging operation based on the ranging information. In addition, as an example, the publisher STA 1410 and the subscribe STA 1420 may call additional methods and events to exchange additional information through a follow-up message, and then perform an FTM procedure. It is not limited to the example.

In this case, the initiator STA may be relative distance information in the relationship with the responder STA based on the above-described FTM procedure. Also, as an example, the positional relationship of the responder STA may be known. In this case, the initiator STA may transmit the information obtained based on the FTM procedure to the responder STA using a follow-up message. In this case, as an example, the follow-up message may include information as shown in Table 8 below. That is, the follow-up message may include NAN interface / NAN MAC address information of the initiator STA. In addition, distance information may be included together with a distance unit as a relative distance to the responder STA. In addition, as an example, information on the location of the initiator STA may be included if necessary.

TABLE 8

In this case, when the responder STA receives the follow-up message including the above-described FTM performance result information, the NAN DE and the NAN MAC of the responder STA may call an event to provide information on ranging to the service / application stage. have.

For example, the responder STA may provide information on the ranging result to the service / application stage by reusing the above-described receive event. In this case, as an example, the service specific information (service_specific_info) among the information included in the above-described receive event may include the information of Table 8 described above. That is, NAN interface (NAN Interface) / NAN MAC Address (NAN MAC Address) information, relative distance information of the starter STA may include information about the location of the starter STA if necessary.

As another example, a ranging result report event may be newly defined. In this case, the ranging result reporting event may be as shown in Table 9 below. That is, the ranging result reporting event may include information about an address, a distance, and a location. In this case, as an example, in the above-described case, the responder STA receives the follow-up message and then provides information as an event based thereon. In this case, a ranging result report event may be defined as the same event for the initiator STA. In this case, as an example, in case of an event of the initiator STA, the address information may include the address of the responder STA and the location information may include the address of the responder STA. In addition, as an example, when the event of the responder STA, the address information may include the address of the initiator STA, the location information may include the address of the initiator STA. That is, a ranging result report event may be defined in relation to the initiator STA and the responder STA. In this case, as an example, information included in address information and location information may be set differently according to the role of the STA, as described above. In addition, for example, even in the case of the initiator STA, it may be possible to reuse the above-described receive event. In this case, the reuse event may include the information shown in Table 8 above. However, in Table 8, the address information and the location information of the initiator may be changed into the address information and the location information of the responder, which may be the same as the ranging result reporting event.

TABLE 9

In addition, as an example, the ranging result reporting event may further include identification information on the ranging service as ranging ID information. In addition, as an example, the ranging result reporting event may further include information on an event type based on a trigger in the ranging service as an event type, and is not limited to the above-described embodiment.

As another example, ranging may operate as a filter for a characteristic service. In this case, as an example, the FTM procedure may be performed based on a ranging operation after checking a matching between a service name and a service ID for a specific service. In this case, as an example, the NAN DE and the NAN MAC of the subscription STA 1420 may call the event as a search result (Search Result ()) to the service / application stage only when a setting condition for a specific service is satisfied. In this case, as an example, the setting condition may be set differently for each specific service and may be set in consideration of service characteristics. In addition, the setting condition may be set based on the distance and the position information, and is not limited to the above-described embodiment.

In addition, as an example, in the case of the active STA, the subscribed STA may check the service name and service ID matching after receiving the active subscribe message. Thereafter, the subscribe STA may perform an FTM procedure with another NAN terminal. In this case, as an example, the other terminal transmits a publish message to the subscribed STA when the result value based on the FTM execution procedure satisfies a specific condition, and the NAN DE and NAN MAC terminals of the subscribed STA transmit the search result event to a service / application stage Can be provided as That is, the ranging operation can be used for filtering for a specific service.

In this case, as an example, when the distance is used as a search filter for a specific service as a ranging result value, an actual value in meters (or kilometers or meters (Km)) may be applied. In addition, it may be possible to search for a NAN terminal within a distance equal to or less than a corresponding value as the threshold distance or vice versa. As another example, it may be possible to inform the index value of a value within a specific range.

As another example, when two different NAN terminals set different distance values or ranging index values, an additional procedure may be performed by applying a trigger condition value to a small value. The reverse may also be possible.

As another example, when a specific condition is set only for one NAN terminal, an additional procedure may be performed if a trigger condition is applied according to the set value. In this case, the NAN terminal in which a specific condition is set may be dependent on the FTM initiator according to the publish type (Solidized, Unsolvated) / Subscribed Type (Active, Passive).

For example, if the passive subscription STA performs filtering on the distance, the passive subscription STA may become an unsolvated publishing STA and a starter STA when performing the FTM, thereby naturally obtaining the result. In this case, as an example, when the result value satisfies a specific condition, the trigger condition for the search result event may be satisfied to call the event to the service / application stage to provide information.

On the other hand, an additional procedure may be required when the unsolvated publishing STA becomes the FTM initiator STA and reports the result value to the passive subscribe STA.

In addition, as an example, after confirming that the distance is filtered on only one side through the publish / subscribe process, the FTM initiator STA may be the one to which the filter is applied through the follow-up message. In addition, if both NAN terminals are filtered for distance, the smaller filtering value may be set to be the FTM initiator STA to exchange the follow-up message.

In this case, as an example, the above information may be specified when the FTM procedure is performed. Alternatively, if the result value is matched with each filtering condition, the following procedure may be performed. Alternatively, in case of operating regardless of this, a procedure of sharing the FTM result value as a trigger condition to the counterpart may be required, and then the next procedure may be performed.

15 is a flowchart illustrating a method of performing a ranging operation.

The first NAN terminal may transmit a first frame including ranging configuration attribute information to the second NAN terminal. In this case, as described above with reference to FIGS. 10 to 14, the first frame may be a service discovery frame. In addition, the first NAN terminal may transmit the ranging configuration attribute information to the second NAN terminal through a publish and / or subscribe message. In this case, as an example, the ranging attribute information may include information on the initiator STA and the responder STA when performing the FTM procedure as the ranging operation, as described above.

Next, the first NAN terminal may perform the FTM procedure based on the ranging configuration attribute information. In this case, as described above with reference to FIGS. 10 to 14, the first NAN terminal may perform an FTM procedure as a ranging operation. In this case, the initiator STA and the responder STA may be set based on the ranging configuration attribute information in the FTM procedure. In addition, as an example, the first NAN terminal and the second NAN terminal may determine a starter STA and a responder STA through negotiation, and are not limited to the above-described embodiment.

Next, the first NAN terminal may obtain distance information with the second NAN terminal based on the performed FTM procedure. (S1530) In this case, as described above with reference to FIGS. In the case of the initiator STA, the first NAN terminal may directly calculate and obtain distance information with the second NAN terminal through an FTM procedure. Also, as an example, when the first NAN terminal is the responder STA, the first NAN terminal may receive and obtain distance information from the second NAN terminal. That is, the initiator STA may calculate and obtain distance information, and transmit the information to the responder STA.

Next, the first NAN terminal may report the acquired distance information to a higher layer through a ranging result reporting event (S1540). At this time, as described above with reference to FIGS. 10 to 14, the first NAN terminal starts. In case of an STA, the first NAN terminal may directly calculate distance information with the second NAN terminal and report the calculated distance information to a higher layer through a ranging result reporting event. In this case, the upper layer may be a single service / application. In addition, the first NAN terminal may report address information and location information on the second NAN terminal as a responder STA to a higher layer through a ranging result reporting event. That is, the first NAN terminal may directly calculate distance information and report additional information together through a ranging result reporting event.

In addition, as an example, when the first NAN terminal is the responder STA, the first NAN terminal may receive a message including distance information from the second NAN terminal. In this case, when the first NAN terminal receives a message about distance information from the second NAN terminal, the first NAN terminal may report to a higher layer through a ranging result reporting event. In this case, the ranging result reporting event may further include address information and location information of the second NAN terminal, as described above.

16 is a block diagram of a terminal device.

The terminal device may be a NAN terminal. In this case, the terminal device 100 includes a transmitting module 110 for transmitting a wireless signal, a receiving module 130 for receiving a wireless signal, and a processor 120 for controlling the transmitting module 110 and the receiving module 130. can do. In this case, the terminal 100 may communicate with an external device by using the transmitting module 110 and the receiving module 130. In this case, the external device may be another terminal device. In addition, the external device may be a base station. That is, the external device may be a device capable of communicating with the terminal device 100 and is not limited to the above-described embodiment. The terminal device 100 may transmit and receive digital data such as content using the transmission module 110 and the reception module 130. In addition, the terminal device 100 may exchange a beacon frame, a service discovery frame, etc. using the transmitting module 110 and the receiving module 130, but is not limited to the above-described embodiment. That is, the terminal device 100 may exchange information with an external device by performing communication by using the transmitting module 110 and the receiving module 130.

According to an embodiment of the present disclosure, the processor 120 of the terminal device 100 may transmit the first frame including the ranging setting attribute information to the second NAN terminal by using the transmission module 110. . In this case, the first frame may be a service discovery frame. In addition, the processor 120 may perform the FTM procedure based on the ranging setting attribute information. In addition, the processor 120 may obtain the distance information with the second NAN terminal based on the performed FTM procedure, and report the acquired distance information as a higher layer. In this case, the acquired distance information may be reported to a higher layer through a ranging result reporting event.

Embodiments of the present invention described above may be implemented through various means. For example, embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof.

For implementation in hardware, a method according to embodiments of the present invention may include one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), and Programmable Logic Devices (PLDs). It may be implemented by field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, and the like.

In the case of an implementation by firmware or software, the method according to the embodiments of the present invention may be implemented in the form of a module, a procedure, or a function that performs the functions or operations described above. The software code may be stored in a memory unit and driven by a processor. The memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.

The detailed description of the preferred embodiments of the invention disclosed as described above is provided to enable any person skilled in the art to make and practice the invention. Although the above has been described with reference to the preferred embodiments of the present invention, those skilled in the art will variously modify and change the present invention without departing from the spirit and scope of the invention as set forth in the claims below. I can understand that you can. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. In addition, while the preferred embodiments of the present specification have been shown and described, the present specification is not limited to the specific embodiments described above, and the technical field to which the present invention belongs without departing from the gist of the present specification claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or prospect of the present specification.

In the present specification, both the object invention and the method invention are described, and the description of both inventions may be supplementarily applied as necessary.

The present invention as described above has been described assuming that it is applied to the NAN wireless communication system, but need not be limited thereto. The present invention can be applied to various wireless systems in the same manner.

Claims (15)

1. A method of performing a ranging operation by a neighbor awareness networking (NAN) terminal in a wireless communication system,

   Transmitting, by the first NAN terminal, a first frame including ranging setup attribute information to the second NAN terminal;

   Performing a fine timing measurement (FTM) procedure based on the ranging configuration attribute information;

   Acquiring distance information with the second NAN terminal based on the performed FTM procedure; And

   Reporting the acquired distance information to a higher layer; including,

   The acquired distance information is reported to the upper layer through a ranging result report event.
2. The method of claim 1,

   When the FTM procedure is performed, the first NAN terminal performs one of an initiator role and a responder role.
3. The method of claim 2,

   When the first NAN terminal serves as the initiator, when the FTM procedure is performed, directly calculating and obtaining the distance information.
4. The method of claim 3, wherein

   When the first NAN terminal serves as the initiator, the ranging result report event further includes at least one of address information about the second NAN terminal and location information about the second NAN terminal. How to perform a ranging operation.
5. The method of claim 2,

   When the first NAN terminal performs the role of the responder, when the FTM procedure is performed, receiving the message including the distance information from the second NAN terminal to obtain the distance information.
6. The method of claim 5,

   When the first NAN terminal serves as the responder, the ranging result report event further includes at least one of address information about the received second NAN terminal and location information about the second NAN terminal. , How to perform ranging operation.
7. The method of claim 2,

   The ranging setting attribute information further includes the initiator role and the responder role setting information.
8. The method of claim 1,

   The ranging operation is performed based on a ranging service;

   When the first NAN terminal receives a method for the ranging service from the upper layer, the first NAN terminal transmits the first frame including the ranging configuration attribute information to the second NAN terminal. Way.
9. The method of claim 8,

   And the ranging operation is performed as a filter operation on a first service.
10. The method of claim 9,

    And if the distance information obtained based on the ranging operation is equal to or less than a threshold value, an additional procedure for the first service is performed.
11. The method of claim 1,

    And the upper layer is a layer for a service.
12. The method of claim 1,

    And exchanging, by the first NAN terminal, distance measurement related information necessary for obtaining the distance information before transmitting the first frame to the second NAN terminal.
13. The method of claim 12,

    The distance measurement related information is exchanged between the first NAN terminal and the second NAN terminal based on at least one of a legacy method and a legacy event.
14. The method of claim 12,

    The distance measurement related information is exchanged between the first NAN terminal and the second NAN terminal when at least one of a dedicated method and a dedicated event for distance measurement is called.
15. A first NAN terminal performing ranging operation in a wireless communication system,

    A receiving module for receiving information from an external device;

    A transmitting module for transmitting information to an external device; And

    A processor for controlling the receiving module and the transmitting module,

    The processor,

    Transmitting a first frame including ranging configuration attribute information to a second NAN terminal by using the transmission module,

    Perform an FTM procedure based on the ranging configuration attribute information;

    Obtaining distance information with the second NAN terminal based on the performed FTM procedure, and

    Report the acquired distance information to a higher layer,

    The first NAN terminal performing the ranging operation, wherein the obtained distance information is reported to the upper layer through a ranging result reporting event.

Images